21.
Thenewcomersfounditimpossibleto________themselvestotheclimatesufficientlytomakepermanenthomesinthenewcountry.（5.0分）
Thenewcomersfounditimpossibleto________themselvestotheclimatesufficientlytomakepermanenthomesinthenewcountry.（5.0分）
